package com.itheima;

import java.security.Key;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;

/**
 * @ProjectName: ybxy6
 * @Titile: MapDemo
 * @Author: 鲁伍加
 * @Description: TODO
 */
public class MapDemo {
    public static void main(String[] args){
        test3();
    }
    public static void test3(){
        Map<String, Double> map = new HashMap<>();
        map.put("张三", 90.0);
        map.put("李四", 80.0);
        map.put("王五", 70.0);
        map.put("赵六", 60.0);
        map.put("赵六", 100.0);

//        map.forEach(new BiConsumer<String, Double>() {
//            @Override
//            public void accept(String s, Double aDouble) {
//                System.out.println(key + "---" + aDouble);
//            }
//        });
        map.forEach((key,value)-> System.out.println(key + "---" + value));

    }
    public static void test2(){
        Map<String, Double> map = new HashMap<>();
        map.put("张三", 90.0);
        map.put("李四", 80.0);
        map.put("王五", 70.0);
        map.put("赵六", 60.0);
        map.put("赵六", 100.0);
        //将map集合中的所有键值对取出来放到set集合中
        Set<Map.Entry<String, Double>> entrySet = map.entrySet();
        for (Map.Entry<String, Double> entry : entrySet) {
            String key = entry.getKey();
            Double value = entry.getValue();
            System.out.println(key + "---" + value);
        }
    }
    public static void test1() {
        Map<String, Double> map = new HashMap<>();
        map.put("张三", 90.0);
        map.put("李四", 80.0);
        map.put("王五", 70.0);
        map.put("赵六", 60.0);
        map.put("赵六", 100.0);
        //将map中的所有键值取出来放到set集合中
        Set<String> keySet = map.keySet();
        //遍历key集合
        for (String key : keySet) {
            //根据key找值
            Double value = map.get(key);
            System.out.println(key + "---" + value);
        }
    }
    public static void test0(){
        Map<String,Double> map = new HashMap<>();
        map.put("张三",90.0);
        map.put("李四",80.0);
        map.put("王五",70.0);
        map.put("赵六",60.0);
        map.put("赵六",100.0);
        System.out.println(map);

        map.remove("张三");
        System.out.println(map);
//        map.clear();
//        System.out.println(map);
        boolean b1 = map.containsKey("李四");
        System.out.println("b1 = "+ b1);
        boolean b2 = map.containsValue(80.0);
        System.out.println("b2 = "+ b2);

        boolean empty = map.isEmpty();
        System.out.println("empty = "+ empty);
        int size = map.size();
        System.out.println("size = "+ size);


    }
}
